It's full steam ahead for tricks, treats, and trains this Halloween weekend. The vintage locamotive at the Colorado Railroad Museum will be leaving the station every half hour, bringing the little ones to a pumkin patch and a silly grave yard. Aboard the train kids can enjoy the not-so-scary haunted railcar and plenty of conductors ready with candy. All aboard for fun. Sat-Sun 9 a.m.

Walk among displays of graphic art and recycled-object sculptures in RedLine’s reinvented exhibition hall. Works by the gallery's resident artists as they explore the concept of "material engagements." Art pieces will hone in on the meanings of material objects and how we, as humans, assign meaning to these pieces in our livess. Tue-Fri 10 a.m.-5 p.m.; Sat-Sun 11 a.m.-5 p.m.

Welcome to the jungle, Denver style. Repticon brings local and national reptile experts together under one roof for live animal presentations, seminars, and more. Colorado's own Linda the Jungle Lady will share stories of reptile encounters, the Colorado Herp Society will discuss native reptile species, and the Mile High Bug Club will be featured in a seminar on how to choose and exotic pet. Sat-Sun 10 a.m.-5 p.m.

Picture this: hundreds of Denver patrons parading the streets in gorilla suits. Walk, run, ride, rollerblade, or skateboard this 5K with a twist to help the Denver Gorilla Run raise funds to protect endangered apes in Central Africa. The best part: The gorilla suit comes with the race entry. Sat 11 a.m.

Say your final adios to summer at this fiesta. The party starts with afternoon happy hour specials and live music from The Big Motif, Mikee T & Friends, and The Whales. Dinner specials will kick those Hispanic-food cravings with guacamole, paella, tamales, and more. With $1 Tecates all afternoon and night long, you'll be able to go home full and happy without breaking the bank. Sat 2 p.m.

Why just be one thing for Halloween? Spend the night as a commando in the spooky, fog-filled laser tag challenge, a demolition derby champ at the haunted bumper cars, spiderman on the creepy climbing wall, and a hockey star or ice princess during the Halloween skate. And don’t forget to dress to impress—the night concludes with a costume contest. Sat 6-9 p.m.

This Halloween party will take effort along with a eclectic wardrobe. Scare the competition with your putting skills. Hit a hole in one and you'll have a shot at prizes from the pro shop like new clubs and clothes that should keep you on the course through the winter. If putting isn't your strong suit, try the costume contest or the dance floor. Sat 6 p.m.

Spend an evening in the city life. Enjoy the culinary talents of Frank Bonanno (Bonnano Concepts), Justin Cucci (Root Down and Linger), and the teams from Elway's and Eat + Drink Denver in small-plate style. While you dine, listen to hits from country songwriter Pete Martinez followed by a live and silent auction. The event benefits Roundup River Ranch, a community of programs and camps for children with chronic and life-threatening illnesses. Sat 6-10 p.m.

Rolling Stone featured this 33-year-old strummer as the lone woman and youngest artist on its 2006, "The New Guitar Gods" list. King uses an acoustic guitar and lap steel guitar in her shows among other instruments, to make her jazz-infused melodies, and signature style of using the guitar for percussive beats. "Great Round Burn" and "King Pizel" are a couple of tracks to listen for from her recently released album, Glow. Sat 7 p.m.

Often the only consequence of a Halloween party is a November 1st hangover. Not at the Denver Halloween Bash where your ticket goes to cancer research at Denver Hospital. The party has all the ingredients of a first-class Halloween throw-down—lights, fog, star DJs, an open bar, drink sponsors like Peak Seven Vodka, and a costume contest—with a bonus: a little bit of karma. Sat 8:30 p.m.

Why reserve a Halloween party for a ballroom when you can take over a whole hotel? That's the theory behind the trifecta of ColoWeen parties taking place in Denver the weekend prior to Halloween. You have a choice of theme depending on location: medieval at the Double Tree Hotel, Hollywood-zombie at the Jet Hotel, or high-class Illuminati at the Parkside Mansion. At each, the costume contest is high stakes—the winner takes home $2,000. Sat 9 p.m.